A man has surprised his wife with a Valentine's Day serenade live on air.

Peter Bing took to the stage at Wednesday's taping of The Projectto sing Billy Joel's 'She's Got a Way' to his wife Sally, who was in the audience and had no idea about her husband's romantic performance plans.

In a pre-recorded video, Peter said he wanted to do something special for his wife, who had been "extremely unwell" for some time.

"She had an 80-90 percent chance of passing away, so it was a pretty traumatic time for us."